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18.3 Measurement Items and Calculations
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* U: Voltage between lines (phase voltage for 3-phase, 4-wire wiring); I: Line
current; Uave:Iave: Average voltage/average current; si: Lead/lag polarity, "+1"
is lag, "-" is lead.
* u: measurement channel; M: number of samples; s: sample point number; m:
number of samples per cycle (128 for 50/60 Hz, 16 for 400 Hz)
* Two different methods of calculating the reactive power can be selected. There
are also two different methods for calculating the apparent power, depending
on how the reactive power is calculated.
*"si" is detected by the reactive power meter method.
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